code: def set_pipeline_forward(
      self,
      model_cls: nn.Module,
      pipeline_forward: Callable,
      policy: Dict,
  ):
      if self.pipeline_stage_manager:
          stage_manager = self.pipeline_stage_manager
          if self.model.__class__.__name__ == "ViTModel":
              module = self.model
          else:
              module = self.model.vit
  
          layers_per_stage = Policy.distribute_layers(
              len(module.encoder.layer), stage_manager.num_stages
          )
          stage_index = Policy.get_stage_index(
              layers_per_stage, stage_manager.stage
          )
          method_replacement = {
              "forward": pipeline_forward(
                  stage_manager=stage_manager, stage_index=stage_index
              )
          }
          self.append_or_create_method_replacement(
              description=method_replacement,
              policy=policy,
              target_key=model_cls,
          )
  
imports: import warnings
  from typing import Callable, Dict, List, Union
  import torch.nn
  import colossalai.shardformer.layer
  from colossalai.shardformer.layer import DropoutForReplicatedInput, Linear1D_Col
  from ..modeling.jit import get_jit_fused_dropout_add_func
  from ..modeling.vit import ViTForImageClassification_pipeline_forward, ViTForMaskedImageModeling_pipeline_forward, ViTModel_pipeline_forward, get_jit_fused_vit_output_forward, get_vit_flash_self_attention_forward
  from .base_policy import ModulePolicyDescription, Policy, SubModuleReplacementDescription
label_desc: Use image node_id 7 for calling the ViTPolicy obj's underlying member method code with example usage: obj.set_pipeline_forward(model_cls, pipeline_forward, policy) without return types